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15131 Alanalda (2000 ET54)
Classification: Main-belt Asteroid          SPK-ID: 2015131
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1159592597600479 1.8498e-08  
a 2.616979487877523 1.0295e-08 au
q 2.313516483656016 4.8988e-08 au
i 6.625593149769536 1.0719e-06 deg
node 61.29220246360262 9.1767e-06 deg
peri 225.2131378410214 1.247e-05 deg
M 247.2559636660295 1.3808e-05 deg
tp 2459684.772695244268
(2022-Apr-15.27269524)
6.0665e-05 TDB
period 1546.31833271883
4.23
9.1244e-06
2.498e-08
d
yr
n .2328110534439738 1.3738e-09 deg/d
Q 2.92044249209903 1.1488e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2399  
   data-arc span      15290 days (41.86 yr)  
   first obs. used      1979-04-26  
   last obs. used      2021-03-06  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46044  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Mar-17 00:27:13  

Additional Information
 Earth MOID = 1.30094 au 
 Jupiter MOID = 2.2141 au 
 T_jup = 3.388 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.77   n/a E2021B10  
rotation period rot_per 4.69135 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Pal, A.; Szakats, R.; Kiss, C.; Bodi, A.; et al. (2019) Ap. J. Supl. Ser. 247, id.26.]

15131 Alanalda           Discovered 2000 Mar. 10 by Spacewatch at Kitt Peak.
Alan Alda (b. 1936) is an American actor, director, screenwriter and author. Best known as Benjamin Franklin "Hawkeye" Pierce in the TV series M \ast A \ast S \ast H, Alda has won numerous awards for his work including 6 Emmys and 6 Golden Globes. Alda hosted the acclaimed PBS series Scientific American Frontiers from 1993 to 2005.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20110615/MPCPages.arcLast Updated: 2013-03-28

[ show close-approach data ]
Alternate Designations
 2000 ET54 = 1979 HW 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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